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'.HARLAN, OF aan WING, MINNESOTA.

Letters Patent No. 76,078, dated March 31, 1868,

IMPROVEMENT IN HORSE-SHOES.

TO ALL WHM IT MAY CONGERN:

Be it known that I, ALBERT S. HOPSON, of Plainview, in the countysof Wabasliaw, and State oi' Minnesota, have invented anew and usei'ul Improvement in Horse-Shoes; and'I do hereby declare that-the following is a full, clear, and exact description thereof, which will enable those skilledv in the art to make and use the` same, reference being had to the accompanying drawings forming part of this specification.

The present invention consists, irs't,in making a horseshoe of wrought, cast, or malleable iron, lwith a slot or opening at heel and toe for the reception of calks that are slid in from one side, and there securedin any suitable manner; second, in making the calks of iron or steel, so constructed with a rib or projection at one end that they may besecured within the slots of the horse-shoe, suitably formed therefor by means of keys or wedges acting upon such rib or projection-` In thevaccompa'nying plate of drawings my improvementsin horse-shoes are illustrated- Y Figure 1 beingr a plan or top view of the treading-surface to a horse-shoe made according thereto, and

Figure 2 a section taken in the plane of the line x rv, tig. 1. i

Similar letters of reference indicate corresponding parts.

A, in thev drawings, represents a horse-shoe, which I make of wrought, cast, or malleable iron, with an opening or slot, B, in each toe C, and at and across the heel D. These slots, B, are for the reception of calks E, that are slid into place from one side or the other of the shoe, wherein, by means of Wedges or keys F, they are secured and held. The calks E, I make of either'steel or iron, and at one end with a rib orprojeetion, G, which sets into' the enlarged inner end or portion H of the slots B, where, by means of the wedges o1" keys F driven into such enlarged portion over and upon the upper side of thc said ribs G, they .are held and secured.

By driving the edge below the ribs to the calks inthe slots, instead of above the same, or by driving wedges Aboth above and below, it is plain-ly obvious the'distance to which the calks project from the shoe'will he corresponclingly more or less.

By securing the calks in the manner above described, it is plainly obvious that to remove them, and insert new ones, it does hot require that the shoe should be detached from the hoof-an advantage of much importance.

I claim as new, and desire to secure by Letters Patenty p In combination with the horse-shoe, having slots or openings at the toes and heel, the calks, when provided with a rib or projection, and secured by Wedges or keys, substantially as and for the purpose specified. l

l ALBERT S. HOPSON.

Witnesses:

IRA B. Porn, U. F. SARGENT.` 

